I still want to see Matrix get adopted for messaging by default. Purism actually did it with their Librem 5 (probably one of the few good things about that company, but that's a rant for another day).
That sounds like hell. If you think that carrier interop is bad now, wait till everyone is using a different matrix provider with different optional features turned on or off. At least today there are some barriers to SMS spam, matrix would open the floodgates while making blocking it exponentially worse.
